Don't worry if you can't type subscripts. For example, you can write water as H20. Just remember that when hand-writing formulas, subscripts should be written like this: HO 1. Which of the following elements exists in nature as a diatomic molecule? Underline the correct answer: Lithium Chlorine Iron 2. Name the following compounds: PC13 NaF Formula FeO3 HSO4(39) HF(aq) 3. Write the formulas of the following compounds: Name Sulfur hexafluoride Rubidium bromide Copper(II) chloride Chlorous acid Hydrosulfuric acid Name Formula Carbon